\begin{table}%t2
%\centering
\par
\caption{\label{resum}Summary of coronagraphic results and comparison with 
\mbox{theory}.}
\begin{tabular}{lllll}
\hline \hline 
Metrics & \multicolumn{2}{c}{Measured on bench} & \multicolumn{2}{c}{Theory}  \\
\cline{2-5}
&  \multicolumn{4}{c}{$\Delta \lambda / \lambda [\%] $} \\
\cline{2-5}
&  $1.4$& $20$& $1.4$ & $20$ \\
\hline
Contrast at 3$\lambda/D$ & $5.0 \times 10^{-5}$ &  $1.5 \times 10^{-4}$ & $1.4 \times 10^{-6}$ & 
$1.2 \times 10^{-5}$ \\
Contrast at 12$\lambda/D$ &$2.3 \times 10^{-6}$ &  $3.5 \times 10^{-6}$ & $2.1 \times 10^{-7}$ & 
$2.8 \times  10^{-7}$ \\
Contrast at 20$\lambda/D$ &$1.2 \times 10^{-6}$ &  $1.8 \times 10^{-6}$ & $1.0 \times 10^{-7}$ & $1.3 \times 10^{-7}$ \\
\hline
Total rejection & 489 & 355 & 1000 & 641 \\
Peak rejection & 627 & 674 & 1058 & 788 \\
\hline
\end{tabular}
\end{table}